CORRECTIONS! I mean footbridge, not catwalk (I did speculate on a mega-catwalk though)

In general, I mean "footbridge", "flyover", as in elevated platforms built for use by pedestrians, generally to cross avenues, for instance.

I did however speculate on the possibility of a footbridge mixing this function with that of a catwalk, as a way to make it feasible in a sophisticated neighborhood where famous designers promote fashion shows once year.

It's a more far-fetched idea that I also intend to develop or elaborate on, but for the moment I would like to approach the cases where the benefits of such mega-footbridges would be more relevant or obvious, as in avenues in less affluent areas with gigantic traffic jams that are regularly the taken by savage floods.